Had no end of trouble setting up the workstation. Turned out that the fan on the second processor was broken and it kept overheating. Managed to get hold of another processor/fan and installed it. Ran some tests last night and all seems to be working well. I have 3 activer render tiles, 1 for the main PC and 2 for the dual P3 :-) On the few test renders I did it looks like render time is reduced by over a third compared to rendering on my main PC (P4 2.0Ghz) Thanks again for all the replies. Regards Tony